You cannot upgrade the graphics card in a laptop.
Looking at your computer information, I'd recommend getting a new computer that meets or exceeds the recommended requirements for Sims 4. As it's not a finished game, and you want something that will play the game without too many issues.
This post linked below has the recommended specs listed in a spoiler.
[READ FIRST] Make sure you meet minimum requirements (PC)
https://answers.ea.com/t5/Technical-Issues-PC/READ-FIRST-Make-sure-you-meet-minimum-requirements-PC/m-p/6420780#M102196
If you find a laptop or desktop and have questions about it, please let us know. We'll be happy to help. 🙂
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